2004 VU Berlingo 1.4i (M59) Cooling Fan Issues

[GiveMeABreak]

The table should answer your questions, but the post-cooling threshold for triggering the fan is 105 °C and can last up to 6 minutes.

Post ventilation
When stopping the engine, the engine ECU controls the post cooling (slow speed), if the measured engine coolant temperature is over a programmed level.

Description	Action	3-speed (*) All engine types with air conditioning
Cooling temperature warning threshold	Ignition system Switching off	118 °C 115 °C
Length of post cooling	-	360 s
Temperature threshold for triggering post-cooling	-	105 °C
Coolant temperature limit for low speed	Engagement Cut-off	97 °C 94 °C
Coolant temperature limit for high speed	Engagement Cut-off	105 °C 102 °C
Temperature for triggering of the cooling fan	-	97 °C

[Blazer811]

Thanks for the info GiveMeABreak, but before I changed the HG I could never recall the fan kicking in at 105 degrees with the engine turned off and temperature exceeding that.

I know for sure that whilst driving with the old HG, the low speed fan kicked in at 97 degrees and when the temperature got near the 115 degrees mark the high speed used to kick in. The fan also comes on when aircon is engaged, so this being the case, would it most likely be a ecu problem if the fan doesn’t post cool @ 105d??

[GiveMeABreak]

The fan coming on when A/C is engaged is perfectly normal and expected behaviour. As for the Post cooling, I wouldn't get too hung up on it as there may be a slight discrepancy in the measuring of a degree or 2, but obviously if the temperature after engine off is well above the threshold of 105 °C, then I would be suspecting the water temperature sensor. If the fan is working at all 3 speeds, then there is nothing wrong with the ECU or the fan.

[Blazer811]

Thanks for your help GiveMeABreak

[Blazer811]

The fan coming on when A/C is engaged is perfectly normal and expected behaviour. As for the Post cooling, I wouldn't get too hung up on it as there may be a slight discrepancy in the measuring of a degree or 2, but obviously if the temperature after engine off is well above the threshold of 105 °C, then I would be suspecting the water temperature sensor. If the fan is working at all 3 speeds, then there is nothing wrong with the ECU or the fan.

Hi Marc today the temperature here in Australia was 35 degrees Celsius so I thought it would be ideal to take the Berlingo for a good run to see how the cooling system responds. Every thing seemed fine, fan on when air con is running, fan kicks in @ 97d when air con is off and temperature on gauge sits between 90 - 100d. But when I turn engine off when temp is towards the 100d mark and then check temp gauge around 5 mins after, the temp is getting close to the 120d mark, with no high speed fan engaging.

I had replace both green and blue temp sensors about 1 month ago and was told that the Tridon TCS211 (Green) and Fuelmiser CTS180 (Blue) are the correct sensors for this vehicle. I know that the green one engages the lower speed fan @ 97d but was told that the blue one kicks in @ 120d.

I did inform them that it doesn’t sound right as the blue sensor should be engaging the high speed fan a lot sooner, but everywhere I call for this part is telling me that theirs engages at 120d?

Can you recommend a blue temp sensor that will engage @ 105d, so that I can swap it with the one that’s currently in?

[GiveMeABreak]

So there are 2 water temp. sensors - the Green one in the water outlet housing and the blue one under the Cylinder head:

The part numbers I have are:

Coolant Outlet Tank Part: 9636777180 (M12X150 2 way) - Green

Under Cylinder Head Part: 024286 (14 X 1.25 118 °C) - BLUE

So the blue one is an 118 °C - which corresponds to my table in the previous post.

I can't vouch for aftermarket parts - but these are the OEM part numbers.

[Blazer811]

So there are 2 water temp. sensors - the Green one in the water outlet housing and the blue one under the Cylinder head:

With respect to the fan being triggered if temperature exceeds 105d with engine turned off, is this operation triggered by the temperature value from the Blue or Green sensor.

My understanding is that when the engine is running, the fan low speed is triggered when the temperature value from the green sensor reaches 97d and the fan high speed and STOP warning light are triggered when the blue sensor temperature value reaches 118d. If this is the case, would I be correct in assuming that the post cooling @ 105d is triggered from the blue temp sensors value via the ecu?

I can now recall that prior to the HG being replaced that the low speed would engage at 97d and when the temperature soared the high speed and stop warning lights on the dash would engage around the 115 -118d mark, but I could never recall the fan engaging when the engine was turned off and temp was above 105d.

Presuming that my temp sensors, ecu and fans are working as they should be when engine is running, could the fan speed resistor be the reason that the post cooling is not engaging?

[GiveMeABreak]

Not really as the fan would be all or nothing if the resistor was at fault.

The thing is here is that there are 2 functions going on FRIC and BRAC (I know, I know, but it's not a kids TV show). FRIC is the cooling of the engine temperature controlled by the Injection ECU and BRAC is the cooling function of the Air Conditioning system , generally controlled by the BSI. So there can be 2 systems controlling the fans - A/C pressure and engine temp. There's too much to go into, but the blue one is obviously designed to kick out the warning at 118 °C